菜鸟看I/O!!

来源：互联网发布：中国电信云计算编辑：程序博客网时间：2024/05/17 01:41

今天看了jsp中的文件I/O技术，总体来说挺不错的.

我发现在应用该技术的时候，一定要先写上下面一段代码，

String thePath = request.getRealPath("/")+"ch11//theFile";

用来获取该文件的真实路径。

下面是一段关于文件应用的小程序。

<%@ page language="java" import="java.util.*,java.io.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>My JSP 'wk.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<%
String thePath=request.getRealPath("/")+"D://work//";
File myFile = new File("D://work//","work.txt");
myFile.createNewFile();
FileWriter myFileWriter = new FileWriter(myFile);
myFileWriter.write("hello,you are welcome.");
myFileWriter.flush();
myFileWriter.close();
out.println("写入成功!<br>");
char[] chrRead =new char[3600];
FileReader myFileReader = new FileReader(myFile);
myFileReader.read(chrRead);
out.println(chrRead);
myFileReader.close();

%>
</body>
</html>